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LMV7219:  LMV7219：Whether the input pin has a reverse diode？

xie dong
Prodigy 50 points
Part Number: LMV7219
Other Parts Discussed in Thread: TL331, LM2903, TLV9031

Tool/software:

Is the input pin of this chip integrated with a reverse diode? Use a multimeter to measure a voltage drop of 0.6V at the reverse end

  • 0
    TI__Guru 58606 points

    Hello Xie,

    Yes. The LMV7219 has ESD diodes from the inputs to both V+ and V-.

    The Abs Max has limits are referred to the supply voltage, which generally indicates there are ESD diodes.

    This can be confirmed by using the DMM diode check function and measure from the input to V+ or V-. You should get 0.6V in one direction, and high impedance (or around 1.2V) in the other direction.

  • 0 in reply to Paul Grohe
    Prodigy 50 points

    1. I can't find the functional block diagram in your diagram in the data manual, can I send a link?
    2, which device input without diode, this protection will be my input waveform clamp

  • 0 in reply to xie dong
    TI__Guru 58606 points

    Hello Xie,

    The "block diagram" is in section 7.2 of the datasheet. Though it does not show the ESD diodes.

    I'm not quite sure of question #2. Are you asking which devices do NOT have the upper diode?

    See the TL331 / LM2903 and the TLV9031 families - these do not have the upper ESD diodes and can be taken up to 6V without damage.

    We recommend external clamping and not do rely on the built-in ESD diodes to clamp signals.